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# RaToPUS, radiation tolerant AC-DC power supply
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**Disclaimer:**<br>
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**Manufacturing the power supply according to the design published in this project does not ensure it will be resistant to radiation. Only using the components from a lot qualified in irradiation campaign guarantees that this power supply will withstand the radiation levels mentioned in the specification.**
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## Project description
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RaToPUS is a 100W AC/DC power supply compatible with the CompactPCI-Serial standard (CPCI-S.0). It is designed in the frame of the Distributed I/O Tier project to be used in radiation-exposed installations of the HL-LHC at CERN.
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**Disclaimer:**<br>
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**Manufacturing the power supply according to the design published in this project does not ensure it will be resistant to radiation. Only using the components from a lot qualified in irradiation campaign guarantees that this power supply will withstand the radiation levels mentioned in the specification.**
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## Main Features
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| Parameter | Value |
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... | ... | @@ -21,12 +21,12 @@ RaToPUS is a 100W AC/DC power supply compatible with the CompactPCI-Serial stand |
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| Transient response | 10% maximum deviation; <br> Returns to nominal Vo in 1 ms maximum.|
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| Total Ionizing Dose (TID) | ≥500 Gy |
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| PCB dimensions | 100 mm x 160 mm x 37 mm |
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| PSU dimensions (including packaging) | 3U x 170mm x 8HP (133mm x 170mm x 40mm |
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| PSU dimensions (including packaging) | 3U x 170mm x 8HP (133mm x 170mm x 40mm) |
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| External monitoring | PMBus: Conveys output voltages, output currents, temperature |
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| External control | PS_ON pin for remote switching ON/OFF |
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| EMI specifications | EN55022 Class B |
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| Thermal environment:<br>- Ambient temperature<br>- Active cooling | <br>40ºC<br>No |
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| Redundancy/load sharing | Passive (droop-based) |
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| Redundancy/load sharing | 2 instances of RaToPUS sharing full load: +12V, 100W and +5V, 10W with ±5% tolerance (45%/55% or better) |
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## Architecture
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RaToPUS is designed in two stages:
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